Non-contact detection method for leakage of gas with temperature higher than environment temperature

Abstract

The invention relates to a non-contact detection method for the leakage of gas with a temperature higher than an environment temperature, belonging to the technical fields of experimental mechanics and gas seal measurement. The non-contact detection method comprises the following steps: photographing a whole-field image of a to-be-detected region in real time by virtue of an infrared thermal imager to obtain a group of infrared images, so as to obtain corresponding temperature fields; carrying out temperature gradient operation on the obtained temperature fields, so as to obtain a temperature gradient; and processing the images by combining a heat conduction theory with an infrared image processing algorithm, so as to obtain a gas leakage position and a leakage rate. The position and the leakage rate during the leakage of gas with the temperature higher than the environment temperature are measured based on an infrared thermal imaging technique, an image processing theory and the heat conduction theory, so that the precise location of the leakage position and the quantitative measurement of the leakage amount can be simultaneously realized; and the non-contact detection method is wide in applicability, is not limited in certain specific gas and has the characteristics of high detection sensitivity, anti-jamming capability and the like.

Description

technical field [0001] The invention relates to a leakage detection method for gas with a temperature higher than the environment, and belongs to the fields of experimental mechanics and gas sealing measurement. Background technique [0002] Gas leakage has become a major safety hazard in industrial production and pipeline transportation. It is particularly important to quickly assess the gas leakage situation and take on-site emergency measures. [0003] In the known methods of measuring gas leakage by thermal imaging, the gas leakage is mainly detected by methods such as gas infrared spectrum absorption characteristics, temperature changes before and after leakage, and the like. However, some of the above methods are only applicable to specific gases; some need to collect temperature images before and after the leak, which has defects such as cumbersome process and long measurement cycle; at present, it is urgent to develop a simple and fast method to simultaneously obtain...

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Problems solved by technology

However, some of the above methods are only applicable to specific gases; some need to collect temperature images before and after the leak, which has defects such as cumbersome process and long me

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